If you want a smooth starting transmission use a clutch and flywheel on a standard transmission.
Automatic transmissions have that pesky torque converter thingy that robs power most of the time, a hydraulic pump that zaps drive power all the time and it requires electrical power all the time to operate valves on the valve body and lock the torque converter.
You can replace the power robbing torque converter with a clutch and fly wheel and replace the parasitic hydraulic pump with muscle power from your left leg. Lastly the standard transmission will only draw power for the reverse lights when in reverse.
With DC systems you can keep the clutch or go with out.
Instead of being hyper vague why dont you pitch us a concept and we can set you on a direction to go with proven systems and designs and go from there instead of starting from nothing?
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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